cmd/mdatagen: introduce additional metadata for deprecated metrics #32298

Job	Run time
windows-unittest (windows-11-arm)	52s
windows-unittest (windows-2025)	30s
windows-unittest (windows-2022)	47s
windows-service-test (windows-2025)	50s
windows-service-test (windows-2022)	49s
windows-service-test (windows-11-arm)	56s
	4m 44s

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